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Osmotic Pressure

A 4% soluti...

Question

A $4 %$ solution of sucrose is isotonic with 3% solution with an unknown organic substance. Calculate the molar mass of solute.

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Solution

$M_{s u c r o s e} = M_{u n k n o w n}$

$\frac{4}{432} X \frac{1000}{100} = \frac{3}{x} X \frac{1000}{100}$

$x = \frac{3 X 342}{4}$

$= \frac{3 X 171}{2}$

$= 256.5 g m o L^{- 1}$

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